scholarly journals Effect of Thermal Curing on Slurry Stability and Thermal Conductivity Coefficient of Aerated Concrete Based on Industrial Solid Wastes

2019 ◽  
Vol 37 (1) ◽  
pp. 296-302
Author(s):  
Jun Ji ◽  
Xiaosheng Liu ◽  
Shengying Tan ◽  
Meina Wang ◽  
Wen Ni
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conductivity Coefficient ◽  
Solid Wastes ◽  
Thermal Curing ◽  
Aerated Concrete ◽  
Slurry Stability

Preparation Thermal Insulation Masonry Mortar Using Regeneration Light Sand

2015 ◽  
Vol 768 ◽  
pp. 369-374
Author(s):  
Su Gai Cao ◽  
Pei Xin Li ◽  
Feng Qing Zhao ◽  
Zhi Guo Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Low Cost ◽  
Steel Slag ◽  
Solid Wastes ◽  
Mixture Ratio ◽  
Aerated Concrete ◽  
Optimal Mixture Ratio ◽  
Masonry Mortar

In this paper, ecotype cementing materials (with steel slag, mineral slag etc. as the main raw materials), waste aerated concrete, regeneration light sand and etc. were used as the main materials to prepare thermal insulation masonry mortar. Then the impacts of materials on the mortar’s performances such as strength, density and thermal conductivity were analyzed. At last, it obtained the optimal mixture ratio to prepare thermal insulation masonry mortar with a strength degree of M5. This kind of mortar used a lot of solid wastes as raw materials but with many advantages such as light weight, low thermal conductivity and low cost, all of this made it became a new environmental friendly thermal insulation masonry mortar.

The Study of the Crack-Resistant Plaster Mortar of Sand Autolaved Aerated Concrete Blocks

2012 ◽  
Vol 204-208 ◽  
pp. 1237-1241
Author(s):  
Ze Wu Fu ◽  
San Hai Zeng
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Experimental Method ◽  
Thermal Conductivity Coefficient ◽  
Mechanical Performance ◽  
Single Factor ◽  
Low Thermal Conductivity ◽  
Concrete Blocks ◽  
Aerated Concrete

In view of the problems of crack and falling off when using ordinary mortar aerated concrete blocks, this paper investigate the plaster mortar of sand aerated concrete blocks. On the basis of single factor experiments of the effects of plaster mortar composition on its performance, the properties of plaster mortar are optimized by orthogonal experimental method. The results indicate that the mixture of vitrified microbeads, perlite, fly ash according to a certain proportion can produce laying and the plaster inorganic insulation mortar that exhibit low thermal conductivity coefficient and mechanical performance that meet the requirements.

scholarly journals Regulating Effect of Cement Accelerator on High Content Solid-Wastes Autoclaved Aerated Concrete (HCS-AAC) Slurry Performance and Subsequent Influence

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 799
Author(s):  
Dingkun Xie ◽  
Lixiong Cai ◽  
Jie Wang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Solid Wastes ◽  
Hydration Products ◽  
Promoting Effect ◽  
Adverse Side Effects ◽  
Foaming Process ◽  
Carbide Slag ◽  
Negative Effect ◽  
Aerated Concrete

Adverse side-effects occurred in slurry foaming and thickening process when carbide slag was substituted for quicklime in HCS-AAC. Cement accelerators were introduced to modify the slurry foaming and coagulating process during pre-curing. Meanwhile, the affiliated effects on the physical-mechanical properties and hydration products were discussed to evaluate the applicability and influence of the cement accelerator. The hydration products were characterized by mineralogical (XRD) and thermal analysis (DSC-TG). The results indicated that substituting carbide slag for quicklime retarded slurry foaming and curing progress; meanwhile, the induced mechanical property declination had a negative effect on the generation of C–S–H (I) and tobermorite. Na2SO4 and Na2O·2.0SiO2 can effectively accelerate the slurry foaming rate, but the promoting effect on slurry thickening was inconspicuous. The compressive strength of HCS-AAC obviously declined with increasing cement coagulant content, which was mainly ascribed to the decrease in bulk density caused by the accelerating effect on the slurry foaming process. Dosing Na2SO4 under 0.4% has little effect on the generation of strength contributing to hydration products while the addition of Na2O·2.0SiO2 can accelerate the generation and crystallization of C–S–H, which contributed to the high activity gelatinous SiO2 generated from the reaction between Na2O·2.0SiO2 and Ca(OH)2.

The effect of variable properties and rotation in a visco-thermoelastic orthotropic annular cylinder under the Moore–Gibson–Thompson heat conduction model

2021 ◽  
pp. 146442072098589
Author(s):  
Ahmed E Aboueregal ◽  
Hamid M Sedighi
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stresses ◽  
Thermal Conductivity Coefficient ◽  
Variable Properties ◽  
Transformation Technique ◽  
Present Contribution ◽  
Conduction Model ◽  
Thermoelastic Model ◽  
Shock Heating ◽  
Physical Fields

The present contribution aims to address a problem of thermoviscoelasticity for the analysis of the transition temperature and thermal stresses in an infinitely circular annular cylinder. The inner surface is traction-free and subjected to thermal shock heating, while the outer surface is thermally insulated and free of traction. In this work, in contrast to the various problems in which the thermal conductivity coefficient is considered to be fixed, this parameter is assumed to be variable depending on the temperature change. The problem is studied by presenting a new generalized thermoelastic model of thermal conductivity described by the Moore–Gibson–Thompson equation. The new model can be constructed by incorporating the relaxation time thermal model with the Green–Naghdi type III model. The Laplace transformation technique is used to obtain the exact expressions for the radial displacement, temperature and the distributions of thermal stresses. The effects of angular velocity, viscous parameter, and variance in thermal properties are also displayed to explain the comparisons of the physical fields.

Measuring the Thermo-Technical Parameters of Autoclaved Aerated Concrete

2016 ◽  
Vol 824 ◽  
pp. 100-107 ◽  
Author(s):  
Alena Struhárová
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
Physical Properties ◽  
Bulk Density ◽  
Capillary Absorption ◽  
Measuring Device ◽  
Technical Parameters ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Technical Properties

Bulk density and moisture content are factors that significantly affect the physical properties of autoclaved aerated concrete (AAC) including thermal conductivity and other thermo-technical characteristics. This article shows the results of measurements of compressive strength, capillary absorption, water absorption and porosity of AAC (ash on fluidized fly ash) at different bulk density and also the results of thermal conductivity of AAC at different bulk density and variable moisture content of the material. The thermo-technical properties were measured using the Isomet 2104, a portable measuring device. Acquired results demonstrate dependence of physical properties including thermal conductivity of AAC on bulk density and moisture content. The reliability and accuracy of the method of measuring was also shown.

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